<volist name="parents" id="parent">
    <php>$pid = $key; $class = $level.'_'.$pid; $class_g = $pro?$pro.'_'.$grand[$pid]:'';</php>
    <li class="{$class} {$class_g} region_li">
        <input type="checkbox" value="all" data-pid="{$pid}" title="{$parent}"
               class="lay-input {$level}_all_{$pid}" lay-filter="city">
        <volist  name="$children[$key]" id="child">
            <input type="checkbox" name="region[3][{$pid}][]" data-pid="{$pid}" title="{$child['child']}" value="{$child['region_id']}"
                   class="lay-input {$level} {$level}_child_{$pid}" lay-filter="city">
        </volist>
    </li>
</volist>
